The CBOT was mixed to start the week with wheat futures tumbling to new lows under pressure from Black Sea values and the EU’s recent move to block imports of Ukrainian grain into five key countries. Recent precipitation in the U.S. also kept futures on the defensive and funds remain eager and aggressive sellers and added to their net short positions for the day. Soybeans, on the other hand, pushed higher for the day in follow-through buying from Friday’s reversal with expectations of tight U.S. stocks and a strong crush program this summer supporting values. Corn was caught somewhere in the middle and posted small losses to conclude a day of two-sided trade. Exports and weather remain the primary market drivers.  USDA&rsq...